Monday, December 21, 2015

J-Head Mk 8 and Mk 9 hot-ends

Lately, I have been asked if I will be making more J-Head Mk 8 hot-ends. In addition, I have developed a proper J-Head bowden hot-end that is based off of the J-Head Mk 8 and have named it the J-Head Mk 9.

However, I will not be producing nor selling more of the J-Head Mk 8's and Mk 9's because of what has happened to the J-Head hot-end.

The chinese made a poor, rough, copy of a J-Head and spammed it all over the online markets. People bought the cheap knock-offs and those hot-ends failed. The result was that all J-Head hot-ends got blamed for this failure even though the cheap chinese knock-offs were (and are) very different from the real J-Head hot-end. Most of these people now buy other hot-end designs.

The closest open-source analogy that I can think of is this example: Imagine if somebody took FreeBSD, introduced a couple hundred bugs, then released it as a new Linux distribution. Because of this, people begin to dislike Linux. In my opinion, this is what happened to the J-Head hot-ends. (Please note that this is not meant to say anything negative about FreeBSD, it is just an example.)

The concept of open-source design is to take a product and improve it then release the source code or blueprints. It is not to take a product, break it, then not release any information.

Because of this, I have stopped all research and development work towards better J-Head hot-ends. I absolutely refuse to create new designs given what has already happened. I have also noticed that a lot of Reprap-related R&D has stopped in other areas as well. This makes me wonder if the other developers have left due to similar reasons.

I would also like to add that you get what you pay for. Quality products and new research and development cost money and a company that sells both will have to charge a higher price. A cheap, poorly made, knock-off will be cheap in both price and in quality.

I am still selling the J-Head Mk V-BV hot-ends at

Sunday, August 23, 2015

Sales of J-Head Mk 8 Hot-ends

I have been quietly selling J-Head Mk 8 hot-ends.  However, due to the poor quality Chinese counterfeits I am absolutely refusing to sell them openly as I will not be the Chinese R&D guy for their counterfeiting effort.

Sunday, February 8, 2015

J-Head Mk 8 Status Update

The J-Head Mk 8 has been performing quite well.  About 1/2 of the Mk 8's were even sent out without any sealer on the threads and the primary seal worked perfectly as no leaks were reported.

The only minor issue is that I have had a couple of reports of problems with the initial feeding of filament into the hot-end.  Because of this, I may need to make a custom set-screw to resolve the problem.